Ubuntu - Listar os pacotes do apt-get pelo apt-cache search

apt-cache search alguma_coisa

#por exemplo, vamos supor que você tenha esquecido 
#o nome de um plugin do Geany (uma IDE muito boa pra php, html, ...)
apt-cache search geany

#listará os itens abaixo

#geany - fast and lightweight IDE
#geany-common - fast and lightweight IDE -- common files
#geany-plugin-addons - miscellanous plugins for Geany
#geany-plugin-codenav - code navigation plugin for Geany
#geany-plugin-debugger - debugger plugin for Geany
#geany-plugin-doc - documentation plugin for Geany
#geany-plugin-extrasel - extra selection plugin for Geany
#geany-plugin-gdb - GDB plugin for Geany
#geany-plugin-gendoc - documentation generation plugin for Geany
#geany-plugin-gproject - gproject plugin for Geany
#geany-plugin-insertnum - number inserting plugin for Geany
#geany-plugin-latex - improved LaTeX support plugin for Geany
#geany-plugin-lipsum - Lorem Ipsum generator plugin for Geany
#geany-plugin-lua - Lua scripting plugin for Geany
#geany-plugin-macro - macro plugin for Geany
#geany-plugin-numberedbookmarks - numbered bookmarks plugin for #Geany
#geany-plugin-pg - pg plugin for Geany
#geany-plugin-prettyprinter - XML pretty printer for Geany
#geany-plugin-prj - alternative project manager for Geany
#geany-plugin-sendmail - mailer plugin for Geany
#geany-plugin-shiftcolumn - text column shifting plugin for Geany
#geany-plugin-spellcheck - spellcheck plugin for Geany
#geany-plugin-tableconvert - table convert plugin for Geany
#geany-plugin-treebrowser - tree browser plugin for Geany
#geany-plugin-updatechecker - update checker plugin for Geany
#geany-plugin-vc - VCS plugin for Geany
#geany-plugin-webhelper - web helper plugin for Geany
#geany-plugin-xmlsnippets - XMLSnippets plugin for Geany
#geany-plugins - set of plugins for Geany
#geany-plugins-common - set of plugins for Geany (translations)

#depois é só dar um install
sudo apt-get install geany-plugins-common